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+--- Thread: Delay Relay (/showthread.php?tid=8580)
Delay Relay - abbasgts - 09-24-2025
Subject: Request: Sequential 8-relay example for F8 (ESP32-S3), 1.5s step, reverse on shutdown
Message:
Hello KinCony team,
I am using the KinCony F8 (ESP32-S3) board with the PCF8575 I/O expander to control 8 relays. I would like to have an Arduino example that performs the following:
• Sequential ON: Relay1 → Relay8, with 1.5 seconds delay between each relay.
• Sequential OFF: Relay8 → Relay1, with the same 1.5 seconds delay.
• Arduino IDE, using I2C with SDA = GPIO8, SCL = GPIO18, and PCF8575 address = 0x24 (please confirm).
My questions are:
1. What is the exact GPIO mapping for each relay on the F8 hardware revision?
2. Do you have an official Arduino example implementing this sequence?
3. If there is a recommended library or header file for this board, could you please share the link?
Here is a sample code I tested so far (for reference):
#include <Wire.h>
#include <PCF8575.h>
#define I2C_SDA 8
#define I2C_SCL 18
#define PCF8575_ADDR 0x24
PCF8575 pcf(PCF8575_ADDR);
const uint8_t RELAY_PINS[8] = {P0, P1, P2, P3, P4, P5, P6, P7};
void setup() {
Serial.begin(115200);
if (!pcf.begin(I2C_SDA, I2C_SCL)) {
Serial.println("PCF8575 not found!");
while (1);
}
for (int i = 0; i < 8; i++) {
pcf.write(RELAY_PINS[i], HIGH); // OFF at start
}
}
void loop() {
// Sequential ON
for (int i = 0; i < 8; i++) {
Serial.print("Relay ON: "); Serial.println(i+1);
pcf.write(RELAY_PINS[i], LOW);
delay(1500);
}
// Sequential OFF
for (int i = 7; i >= 0; i--) {
Serial.print("Relay OFF: "); Serial.println(i+1);
pcf.write(RELAY_PINS[i], HIGH);
delay(1500);
}
}
RE: Delay Relay - admin - 09-24-2025
your question already repied in another thread.